Today’s knowledge points (March 11, 2020)
32. There is a very important thing at the beginning of every HTML file, DOCTYPE. Do you know what this is for?
31. Please point out the difference between document load and document ready?
30. Advantages and disadvantages of Ajax and how it works?
29. Advantages of web storage compared with cookie
28. The child component passes data to the parent component
27. Steps to enter URL from browser address bar to display page
26. Simple understanding of promise
25. What is the array map() method
24. The difference between sessionstorage, localstorage and cookie
23. What is elegant degradation and progressive enhancement?
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